Novell BUSINESS CONTINUITY CLUSTERING 1.2.1 - ADMINISTRATION Administration Manual page 73

If the clusters are in different trees, or if the User objects are in a separate eDirectory partition than
Cluster objects, you also need to install an instance of the User Object Synchronization driver on a
different port, as shown in
Two-Cluster Driver Set Example with User Object Synchronization
Table 9-3
Cluster Resource and User Object
Publisher Node
Cluster One
Cluster Two
Driver Set Summary for a Two-Cluster Business Continuity Cluster with User Object Synchronization
Table 9-4
Driver Instance
Cluster Resource
User Object
If you have more than two clusters in your business continuity cluster, you should set up
communications for the drivers in a manner that prevents Identity Manager synchronization loops.
Identity Manager synchronization loops can cause excessive network traffic and slow server
communication and performance. You can achieve this by picking one of the servers to be the
master for the group. Each of the peer clusters' drivers communicates to this node.
For example, let's consider a three-cluster business continuity cluster. You can set up a
communications channel for the Cluster Resource Synchronization driver between Cluster One and
Cluster Two, and another channel between Cluster One and Cluster Three. Cluster Two does not talk
to Cluster Three, and vice versa. You must assign a separate port for each of these communications
channels, as shown in Table 9-5
Single-Tree Three-Cluster Driver Set Example
Table 9-5
Cluster Resource
Publisher Node
Cluster One
(master node)
Cluster Two
Cluster Three
Table 9-3 and Table 9-4.
Subscriber Node
Cluster One
Not applicable
CR, port 2002
UO, port 2001
Driver Set for Cluster One
C1 to C2, port 2002
C1 to C2, port 2001
and Table 9-6.
Subscriber Node
Cluster One
Not applicable
CR, port 2002
CR, port 2003
Cluster Two
CR, port 2002
UO, port 2001
Not applicable
Driver Set for Cluster Two
C2 to C1, port 2002
C2 to C1, port 2001
Cluster Two
CR, port 2002
Not applicable
No channel
Configuring the Identity Manager Drivers for BCC
Cluster Three
CR, port 2003
No channel
Not applicable
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